Programming Forums - View Single Post - Linking to a linked list within a linked list

Kry1010 · Apr 5th, 2006, 9:39 AM

Hello,

I'm having problems with linking to a linked list within a linked list. I'm using two different structs within my class 'Players';

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	class Players
{
 private:
        struct playerRec
	{
		char name[25];
		int age;
		int goals;
		struct historyRec* historyPtr;
		struct playerRec* next;
	};

	struct playerRec startPtr;

	struct historyRec
	{
		char club[25];
		int dateJoined;
		int dateLeft;
		struct historyRec* next;
	};
};

Setting up players is working fine, i.e. making a new playerRec node and assigning each of the fields/elements and linking those to other playerRec nodes is fine, the problem i'm having however is creating a new node for the 'historyPtr' to point to, this may help you to understand what I'm saying:

I can create a new 'historyRec' node using;

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struct historyRec* tmpPtr = new struct historyRec;

but when I try to tell 'historyPtr' (in my playerRec) to point to this new node using the following code:

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startPtr->historyPtr = tmpPtr

I get the following error - "Cannot convert from struct Players::historyRec * to struct historyRec*"

Likewise when I try the following:

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 startPtr->historyPtr = new struct historyRec;

Sorry if this is something really simple I have overlooked, I'm fairly new programming especially linked lists.

Can anyone see what I'm missing/doing wrong, any help would be greatly
appreciated, many thanks.

Apr 5th, 2006, 9:39 AM	#1
Kry1010 Newbie Join Date: Apr 2006 Location: UK Posts: 3 Rep Power: 0	Linking to a linked list within a linked list Hello, I'm having problems with linking to a linked list within a linked list. I'm using two different structs within my class 'Players'; (Toggle Plain Text) class Players { private: struct playerRec { char name[25]; int age; int goals; struct historyRec* historyPtr; struct playerRec* next; }; struct playerRec startPtr; struct historyRec { char club[25]; int dateJoined; int dateLeft; struct historyRec* next; }; }; class Players { private: struct playerRec { char name[25]; int age; int goals; struct historyRec* historyPtr; struct playerRec* next; }; struct playerRec startPtr; struct historyRec { char club[25]; int dateJoined; int dateLeft; struct historyRec* next; }; }; Setting up players is working fine, i.e. making a new playerRec node and assigning each of the fields/elements and linking those to other playerRec nodes is fine, the problem i'm having however is creating a new node for the 'historyPtr' to point to, this may help you to understand what I'm saying: I can create a new 'historyRec' node using; (Toggle Plain Text) struct historyRec* tmpPtr = new struct historyRec; struct historyRec* tmpPtr = new struct historyRec; but when I try to tell 'historyPtr' (in my playerRec) to point to this new node using the following code: (Toggle Plain Text) startPtr->historyPtr = tmpPtr startPtr->historyPtr = tmpPtr I get the following error - *"Cannot convert from struct Players::historyRec to struct historyRec"* Likewise when I try the following: (Toggle Plain Text) startPtr->historyPtr = new struct historyRec; startPtr->historyPtr = new struct historyRec; Sorry if this is something really simple I have overlooked, I'm fairly new programming especially linked lists. Can anyone see what I'm missing/doing wrong, any help would be greatly appreciated, many thanks.